Submission #988179

#	Time	Username	Problem	Language	Result	Execution time	Memory
988179		kachim2	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1078 ms	140116 KiB

shoes

    #include "shoes.h"
    #include <climits>
    #include <vector>
    #include <queue>
    #include <iostream>
long long count_swaps(std::vector<int> s) {
      std::vector<int> pos(s.size(), INT_MIN);
      std::vector<int> spos(s.size());
      std::vector<int> rpos(s.size());
      for (int i = 0; i < s.size(); i++) {
        spos[i] = i;
      }
      for (int i = 0; i < s.size(); i++) {
        rpos[i] = i;
      }
      auto qm = new std::queue<int>[100007];
      auto qp = new std::queue<int> [100007];
     
      for (int i = 0; i < s.size(); i++) {
        if (s[i] < 0) {
          if (qp[-s[i]].empty()) {
    	qm[-s[i]].push(i);
          } else {
            auto x = qp[-s[i]].front();
            qp[-s[i]].pop();
    	pos[i] = x;
          }
        } else {
          if (qm[s[i]].empty()) {
    	qp[s[i]].push(i);
          } else {
            auto x = qm[s[i]].front();
            qm[s[i]].pop();
    	pos[i] = x;
          }
        }
      }
      long count = 0;
      for (int i = 0; i < s.size(); i++) {
        if (pos[i] >= 0) {
     
          int wp = s[spos[i]] > 0 ? spos[pos[i]] + 1 : spos[pos[i]];
          count+=spos[i]-wp;
          for (int j = wp; j < spos[i]; j++) {
            spos[rpos[j]]++;
    	rpos[spos[j]] = j;
          }
          spos[i] = wp;
          rpos[wp] = i;
        } 
      }
      /*  for (auto i : spos) {
        std::cerr << i << ' ';
      }
      std::cerr << '\n';
      for (auto i : rpos) {
        std::cerr << i << ' ';
      }
      std::cerr << '\n';
      for (auto i : pos) {
        std::cerr << i << ' ';
        }*/
      return count;
    }

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:10:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |       for (int i = 0; i < s.size(); i++) {
      |                       ~~^~~~~~~~~~
shoes.cpp:13:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |       for (int i = 0; i < s.size(); i++) {
      |                       ~~^~~~~~~~~~
shoes.cpp:19:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |       for (int i = 0; i < s.size(); i++) {
      |                       ~~^~~~~~~~~~
shoes.cpp:39:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |       for (int i = 0; i < s.size(); i++) {
      |                       ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15